GMATPill says:

GMAT Sentence Correction (Active Voice & Clarity)

This is a short sentence about the famous scientist and astronomer, Galileo, and his belief that the Earth was not necessarily the center of the universe. During his time, Galileo caused quite a controversy with the established Church.

Of course, we all know now that the Earth is not at the center of the universe. Instead, the Earth revolves around the Sun, which is part of an even larger Milky Way galaxy that drafts along in the universe.

A few things to note about the GMAT context here. We have the word "being" close to the beginning of the underlined portion of this sentence. We know "being" is a red flag word. That doesn't mean that an answer choice with the word "being" is automatically wrong. It just means that we need to do a double look and make sure it isn't used in an awkward way.

Since "being" is underlined here, we need to pay attention to that part of the sentence.

We also need to pay attention to the part of the sentence that says "was treated as heresy" since this is passive voice. Is passive voice necessarily wrong? What other ways can we phrase this and what other ways do the answer choices suggest?

The question also suggests there are three approaches to phrasing the very first few words of the sentence. Specifically, do you say "theory of" or "theory that" or "theory which" ? Is one necessarily right and the others wrong? Or are there multiple possibilities and it's actually elsewhere in the sentence that our focus should be going to?

These are some of the questions you should keep in mind as you read this GMAT question.

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